Storm Prediction Center Mesoscale Discussion 1320

   Mesoscale Discussion 1320
   NWS Storm Prediction Center Norman OK
   0554 PM CDT Thu Jun 25 2026

   Areas affected...Southeast Wyoming and adjacent counties of
   southwest Nebraska and northeast Colorado

   Concerning...Severe Thunderstorm Watch 391...

   Valid 252254Z - 260030Z

   The severe weather threat for Severe Thunderstorm Watch 391
   continues.

   SUMMARY...A convective band with a well formed cold pool will
   continue developing southeastward with occasional severe gusts into
   southeast Wyoming and adjacent counties in Nebraska/Colorado.

   DISCUSSION...Over the past few hours convection has evolved into a
   well formed leading convective band/trailing stratiform rain
   configuration, and wind profiles are helping maintain updrafts along
   the gust front.  The storms will likely persist for another 2-3
   hours while moving southeastward across southeast WY where slightly
   warmer temperatures/moisture persist at relatively high elevation,
   compared to cooler temperatures farther east at lower elevation into
   the NE Panhandle.  Occasional severe outflow gusts of 60-70 mph will
   be the main threats through 01z.  While eastward progress of the
   stronger storms will be limited by weakening buoyancy with eastward
   extent into NE, the storms could persist into parts of
   north/northeast CO with a low-end severe wind threat through about
   03z.  Since the potential area affected outside of the existing
   watch in WY) is small, the need for a downstream watch is not clear.

   ..Thompson.. 06/25/2026

   ...Please see www.spc.noaa.gov for graphic product...

   ATTN...WFO...BOU...CYS...

   LAT...LON   41910399 41470344 40650353 40450420 40570509 41240585
               41510590 41900531 42390494 42630477 42630440 41910399 

   MOST PROBABLE PEAK WIND GUST...55-70 MPH
   MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN